Aggression Flashcards
(76 cards)
What is the Limbic system
A system that processes information to form long term memories which influence our emotional state.
System includes= hypothalamus, amygdala, and several other nearby areas
What is the function of the amygdala
The centre of emotions and motivations. Involved giving us instinctive feelings/reactions to the environment- including aggression.
What was the procedure of Gospic et al.s Ultimatum game
Used a well established laboratory methods of assessing aggressive behaviour- the ultimatum game.
Proposer (confederate) offers to split money in a certain unfair way with respondent. If the responder accepts, the money is split as proposed but if the responder rejects the offer, both players receive nothing.
Participants in this study played as responders while have their brain scanners by fMRI- highlights activity in different areas of the brain. The researchers found that when responders rejected unfair offers (an aggressive reaction to social provocation), scans revealed a heightened response by the amygdala.
What did the researchers of the ultimatum game find from their procedure
Benzodiazepine drug (which reduces arousal of the automatic nervous system) taken before the game had two effects on responses to unfair offers:
1) It halved the number of rejections (i.e. reduced aggression)
2) decreased the activity of the amygdala. This is strong evidence of an association between reactive aggression and amygdala activity.
What can you say about the reliability of lab studies?
Lab studies have a higher reliability, due to higher controls, increased standardisation. Replicable, able to compare results
What can you say about the validity of the ultimatum game
Lacks mundane realism, the ultimatum game is an artificial task, higher internal validity
—> standardised reduced impacts of extraneous variables. Lower ecological validity, artificial environment.
What is serotonin
A key neurotransmitter that stabilises our moods or feelings of wellbeing
What does serotonin do to the brain
Serotonin impacts your entire body.
Enables brain cells and other NS cells to communicate with each other.
It has widely inhibitory effects on the brain as it slows down neuronal activity
What are two researchers that looked into the link between serotonin and aggressive behaviour
Denton et al. (2012)
Virkkunen (1994)
What did Denson eat al found that linked serotonin to increased aggressive behaviour
Found association between normal concentrations of serotonin present in the orbitonfrontal cortex (OFC) and reduced firing of neurons, which is in tern related to a greater level of behavioural self control. Shows decreased serotonin links to reduced self control + greater impulsivity
What did Virkkunen (1994) find about the link between serotonin and aggression
compared levels of serotonin breakdown in the cerebrospinal fluid of violent impulsive and violent non-impulsive offenders.
found levels were significantly lower in the impulsive offenders.
What is testosterone
Testosterone is an androgen (a male sex hormone)- both males and females have testosterone in their bodies, but males have the hormone more present in their bodies than females.
Often noted that men are more aggressive than women. Especially when testosterone is at highest concentration.
What did Dolan eat al (2001) find about the link between testosterone and aggression.
Positive correlation between testosterone levels and aggressive behaviour in a sample of 60 male offenders in UK security hospitals. These men often had history of impulsivity and personality disorders (psychopaths)
What did research into the link between progesterone and aggression show
Progesterone levels are lowest during and just after menstruation.
Ziomkiewicz et al. (2010)… or say research has found found a negative correlation between progesterone levels and self reported aggression. (Lower levels of progesterone increases aggression).
What are the two types of aggression that can come from, genetic factors
Physical and verbal
What did cockatoo’s 1997 study find about the rates of verbal and physical aggression in MZ and DZ twins
Cockatoo (1997) studied physical and verbal aggression in male adults for both MZ and DZ twins
For physical aggression= concordance rates were 50% for MZ and 19% for DZ twins
For verbal aggression= concordance rates were 28% for MZ twins and 7% for DZ twins
What is the MAOA gene
MAO-A (monoamine oxidase A) is an enzyme, that regulates the metabolism of serotonin (which is linked to aggression.
The production of the MAO-A gene is determined by the MAOA gene
What is the low activity variant of the MAO-A gene
The low activity variant of this gene MAOA-L results in low activity of MOA-A enzyme.
What is the process of the MAO-A gene and how does it link both the MAO-L and MAO-H to aggression
MAO-A enzyme breaks down/ mops up excess serotonin. This regulates serotonin levels within the brain.
The production of the MAO-A enzyme is found by the MAOA (gene). The MAOA gene divides into two variants: MAO-L and MAO-H.
MAO-L is when low activity of an enzyme production increases build up of serotonin in brain. This is linked to increased aggressive behaviour.
The second variant is the MAO-H gene which links high activity of the enzyme with decreased serotonin- this reduces the build up.
What research evidence supports the presence of the MAOA genes
Brunner et al. (1993) = studied 28 male members in a Dutch family who were repeatedly involved in violent crime. Researchers found that these men had abnormally low levels of MAO-A in their brains and the low activity version of the MAOA gene.
Carpi et al. (2002) = studied 500 children, those with MAOA-L were significantly more likely to grow up and exhibit anti-social behaviour, but only if they were maltreated as children. Those with MAOA-L without maltreated and those with MAOA-H with maltreatment did not exhibit anti-social behaviour.
What are ethnological explanations of aggression
Ethology is the study of how the forces of evolution have adapted the behaviour of animals
Early ethnologists looked at wild animals in their natural environment → concentrating on aspects of behaviour that has been passed down generations. These behaviours are used to explain human behaviours- by extrapolating the findings.
How can aggression be an adaptive trait
Adoptive for survival, because a defeated animal is rarely killed, but rather is allowed to establish territory elsewhere which reduces competition.
What did Konrad Lorenz note about aggression
Konrad Lorenz is the Australian zoologist considered to be the father of psychology.
Since not all acts of aggression lead to death, ritualistic behaviours- defined as a series of behaviours conducted in the same, set order are important.
What is the progress of aggression according to ethnological explanations
Stimulus= trigger in environment
Innate realising mechanism (IRM)= a built in physiological process.
Fixed action pattern (FAP)= causing behavioural pattern/ sequence to start